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Wind-blown grains of sand from dunes may carry far inland, covering fields and diverting streams. More seriously, drifting sands can bury whole buildings and transform fertile land into desert. However, dunes can be made more stable by the artificial planting of marram grass, a plant so robust that it can find nourishment even in sand. The grass spreads over the surface of the dune, protecting it against wind, while its roots bind the sand together.